The Museum of HP Calculators

HP Forum Archive 19

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HP 49g+
Message #1 Posted by Fernando on 11 Feb 2009, 10:08 p.m.

Hi all...

Can someone tell me please why when I enter:

DERVX(X^2)

I get 0 (zero)

I already set functions to symbolic and the arithmetic mode is set to exact, what am I doing wrong?

thanks in advanced

      
Re: HP 49g+
Message #2 Posted by Tim Wessman on 12 Feb 2009, 10:07 a.m.,
in response to message #1 by Fernando

http://forums11.itrc.hp.com/service/forums/bizsupport/questionanswer.do?threadId=1310990

TW

      
Re: HP 49g+
Message #3 Posted by Marcus von Cube, Germany on 13 Feb 2009, 4:05 a.m.,
in response to message #1 by Fernando

Check if variable X is defined and purge it. If X is defined, X^2 evaluates to a constant of which the derivative is zero.


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